Like the title says make also an place in the context menu that appears when
right-clicking on an trendline with Insert "RÂ² and equation".
When doing something for school, we must always add the equation and the RÂ² to
the graph.
A button to do this fast would come in handy and save time.
(Okay it's two or three seconds but if you count all those seconds of all the
people on the planet who are using OOo, then mankind could be using more than 10
hours more.)

I confirm that the workflow could be better. As an alternative solution I could
imagine that that the properties dialog of the equation opens up immediately
when inserting a equation, where you than should be allowed to enable or disable
R2 directly and make other changes like precision of the numbers for example.

The context menu was reworked completely within CWS chartuseability01.
All details can be found in the specification:
http://specs.openoffice.org/chart/ChartContextMenu.odt
For this issue a new entry 'Insert R2' is offered in the context menu of an
equation in case R2 was not added so far. Otherwise 'Delete R2' is offered.
In the context menu of a trend line a new entry is offered 'Insert RÂ² and Trend
Line Equation'
in case no equation was added so far.

Sophie, please verify this enhancement in CWS chartuseability01.
Load the attached example document, select e.g. the equation f(x)=0,2x-1,1 and
open the context menu. There should be an entry 'Insert R2". After the R-square
value was added there should be an entry 'Delete R2".
The complete list of entries for the context menu is given in the specification:
http://specs.openoffice.org/chart/ChartContextMenu.odt
Thanks! Ingrid

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